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5. Highly-efficient Ho:KY(WO4)2thin-disk lasers at 2.06 μm

Author

Mateos X, Loiko P, Lamrini S, Scholle K, Fuhrberg P, Suomalainen S, Härkönen A, Guina M, Vatnik S, Vedin I, Aguiló M, Diáz F, Wang Y, Griebner U, Petrov V, and Universitat Rovira i Virgili

Subjects
Medicina ii, Biotecnología, Q-switched lasers, Ciências agrárias i, Odontología, Medicina i, Medicina iii, 2-micron lasers, Geociências, Engenharias iii, Ho-lasers, Monoclinic double tungstates, Thin-disk lasers, Engenharias ii, Astronomia / física, Interdisciplinar, Química, Engenharias iv, Farmacia, Condensed matter physics, Applied mathematics, Electrical and electronic engineering, Electronic, optical and magnetic materials, Materiais, Computer science applications, Ciências biológicas ii, Ciências biológicas i
Abstract

© 2018 SPIE. The recent advances in the development of Holmium monoclinic double tungstate thin-disk lasers are reviewed. The thin-disk is based on a 250-μm-thick 3 at. % Ho:KY(WO4)2active layer grown on a (010)-oriented KY(WO4)2substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce pump geometry, the continuous-wave Ho:KY(WO4)2thin-disk laser generates an output power of 1.01 W at 2057 nm corresponding to a slope efficiency η of 60% and a laser threshold of only 0.15 W. The thin-disk laser is passively Q-switched with a GaSb-based quantum-well semiconductor saturable absorber mirror. In this regime, it generates an average output power of 0.551 W at ∼2056 nm with η = 44%. The best pulse characteristics are 4.1 μJ/201 ns at a repetition rate of 135 kHz. The laser performance, beam quality and thermo-optic aberrations of such lasers are strongly affected by the Ho3+doping concentration. For the 3 at.% Ho3+-doped thin-disk, the thermal lens is negative (the sensitivity factors for the two principal meridional planes are-1.7 and-0.6 m-1/W) and astigmatic. The Ho:KY(WO4)2epitaxial structures are promising as active elements in mode-locked thin-disk lasers at ∼2060 nm.

Published
2018
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6. Ho:KY(WO4)2thin-disk laser passively Qswitched by a GaSb-based SESAM

Author

Universitat Rovira i Virgili, Mateos X; Loiko P; Lamrini S; Scholle K; Fuhrberg P; Suomalainen S; Härkönen A; Guina M; Vatnik S; Vedin I; Aguiló M; Díaz F; Wang Y; Griebner U; Petrov V, Universitat Rovira i Virgili, and Mateos X; Loiko P; Lamrini S; Scholle K; Fuhrberg P; Suomalainen S; Härkönen A; Guina M; Vatnik S; Vedin I; Aguiló M; Díaz F; Wang Y; Griebner U; Petrov V

Abstract

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. A Holmium thin-disk laser based on a 3 at.% Ho:KY(WO 4 ) 2 /KY(WO4)2 epitaxy and single-bounce pumping by a 1960 nm Tm-fiber laser is passively Q-switched with a GaSb-based quantum-well semiconductor saturable absorber mirror. It generates an average output power of 551 mW at 2056 nm with a slope efficiency of 44% (with respect to the absorbed pump power). The best pulse characteristics (energy and duration) are 4.1 ?J /201 ns at a repetition rate of 135 kHz and the conversion efficiency with respect to the continuous-wave regime is as high as 93%.

Published
2018

7. Holmium thin-disk laser based on Ho:KY(WO4)2 / KY(WO4)2 epitaxy with 60% slope efficiency and simplified pump geometry

Author

Mateos, X., LAMRINI, S., SCHOLLE, K., FUHRBERG, P., VATNIK, S., LOIKO, P., VEDIN, I., Aguiló, M., Díaz, F., GRIEBNER, U., PETROV, V., Física i Cristal.lografia de Materials, Física i Cristal·lografia de Nanomaterials, Química Física i Inorgànica, and Universitat Rovira i Virgili

Subjects
Laser materials, Chemistry, 0146-9592, Làsers d'estat sòlid, Espectroscòpia infraroja, Química, Espectroscòpia de làser, Solid-state lasers, Spectroscopy
Abstract

DOI: 10.1364/OL.42.003490 Filiació URV: SI We report on the first Holmium (Ho3+) monoclinic double tungstate thin-disk laser. It is based on a 250 µm-thick 3 at. % Ho:KY(WO4)2 active layer grown on a (010)-oriented KY(WO4)2 substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce (single double-pass) pump geometry, the continuous-wave Ho:KY(WO4)2 thin-disk laser generated 1.01 W at 2057 nm corresponding to a slope efficiency ¿ of 60% and a laser threshold of only 0.15 W. Implementing a double-bounce (second double-pass) for the pump, the output of this laser was scaled to 1.57 W with ¿ = 55%. The maximum stimulated-emission cross-section ¿SE of the Ho3+ ions in the epitaxial layer reaches 2.5×10-20 cm2 at 2056.5 nm for E || Nm. The Ho:KY(WO4)2 epitaxial structures are promising for multi-watt mode-locked thin-disk lasers at ~2.06 µm.© 2017 Optical Society of America

Published
2017
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9. Holmium thin-disk laser based on Ho:KY(WO4)2 / KY(WO4)2 epitaxy with 60% slope efficiency and simplified pump geometry

Author

Física i Cristal.lografia de Materials, Física i Cristal·lografia de Nanomaterials, Química Física i Inorgànica, Universitat Rovira i Virgili, Mateos, X. ; LAMRINI, S. ; SCHOLLE, K. ; FUHRBERG, P. ; VATNIK, S. ; LOIKO, P. ; VEDIN, I. ; Aguiló, M. ; Díaz, F.; GRIEBNER, U. ; PETROV, V., Física i Cristal.lografia de Materials, Física i Cristal·lografia de Nanomaterials, Química Física i Inorgànica, Universitat Rovira i Virgili, and Mateos, X. ; LAMRINI, S. ; SCHOLLE, K. ; FUHRBERG, P. ; VATNIK, S. ; LOIKO, P. ; VEDIN, I. ; Aguiló, M. ; Díaz, F.; GRIEBNER, U. ; PETROV, V.

Abstract

DOI: 10.1364/OL.42.003490 Filiació URV: SI, We report on the first Holmium (Ho3+) monoclinic double tungstate thin-disk laser. It is based on a 250 µm-thick 3 at. % Ho:KY(WO4)2 active layer grown on a (010)-oriented KY(WO4)2 substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce (single double-pass) pump geometry, the continuous-wave Ho:KY(WO4)2 thin-disk laser generated 1.01 W at 2057 nm corresponding to a slope efficiency ¿ of 60% and a laser threshold of only 0.15 W. Implementing a double-bounce (second double-pass) for the pump, the output of this laser was scaled to 1.57 W with ¿ = 55%. The maximum stimulated-emission cross-section ¿SE of the Ho3+ ions in the epitaxial layer reaches 2.5×10-20 cm2 at 2056.5 nm for E || Nm. The Ho:KY(WO4)2 epitaxial structures are promising for multi-watt mode-locked thin-disk lasers at ~2.06 µm.© 2017 Optical Society of America

Published
2017

10. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Subjects
Physics::Optics
Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

Published
2016

19. Theoretical study of population inversion in active doped MIR chalcogenide glass fibre lasers (invited)

Author

Sujecki, S., primary, Oladeji, A., additional, Phillips, A., additional, Seddon, A. B., additional, Benson, T. M., additional, Sakr, H., additional, Tang, Z., additional, Barney, E., additional, Furniss, D., additional, Sójka, Ł., additional, Bereś-Pawlik, E., additional, Scholle, K., additional, Lamrini, S., additional, and Furberg, P., additional

Published
2014
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20. Modelling and design of MIR chalcogenide glass fibre lasers

Author

Sujecki, S., primary, Oladeji, A., additional, Sojka, L., additional, Phillips, A., additional, Seddon, A. B., additional, Benson, T. M., additional, Sakr, H., additional, Tang, Z., additional, Furniss, D., additional, Scholle, K., additional, Lamrini, S., additional, and Furberg, P., additional

Published
2014
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36. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., Fuhrberg, P., Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

37. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., Fuhrberg, P., Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

38. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., Fuhrberg, P., Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

39. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., Fuhrberg, P., Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

40. Numerical modeling of lathanide-ion doped fibre lasers operating within mid-infrared wavelength region

Author

Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., Fuhrberg, P., Sójka, L., Furniss, David, Tang, Zhuoqi, Sakr, H., Barney, Emma R., Benson, Trevor M., Seddon, Angela B., Sujecki, S., Scholle, K., Lamrini, S., and Fuhrberg, P.

Abstract

We discuss the numerical modelling of lanthanide-ion doped chalcogenide glass fibre lasers for operation in the mid-infrared wavelength region. We extract the modelling parameters from emission and absorption measurements using Judd-Ofelt and McCumber theory. Numerical algorithms are developed based on the experimentally extracted fibre parameters. The simulation results predict lasing with slope efficiency of at least 20 % provided, that the fibre loss can be kept at the level of 1 dB/m or less.

41. Diode pumped Q-switched Ho:Lu2O3 laser at 2.12 μm.

Author

Lamrini, S., Koopmann, P., Scholle, K., Fuhrberg, P., and Huber, G.

Abstract

We present the first diode pumped Q-switched Ho:Lu2O3 laser. At room temperature the maximum pulse energy exceeded 5 mJ at 100 Hz pulse repetition rate while the maximum peak power was 23 kW. [ABSTRACT FROM PUBLISHER]

Published
2012

47. Laser-guided real-time automatic target identification for endoscopic stone lithotripsy: a two-arm in vivo porcine comparison study.

Author

Schlager D, Schulte A, Schütz J, Brandenburg A, Schell C, Lamrini S, Vogel M, Teichmann HO, and Miernik A

Subjects
Animals, Female, Swine, Lithotripsy, Laser methods, Ureteroscopy, Urinary Bladder Calculi therapy
Abstract

Introduction and Objective: Thermal injuries associated with Holmium laser lithotripsy of the urinary tract are an underestimated problem in stone therapy. Surgical precision relies exclusively on visual target identification when applying laser energy for stone disintegration. This study evaluates a laser system that enables target identification automatically during bladder stone lithotripsy, URS, and PCNL in a porcine animal model., Methods: Holmium laser lithotripsy was performed on two domestic pigs by an experienced endourology surgeon in vivo. Human stone fragments (4-6 mm) were inserted in both ureters, renal pelvises, and bladders. Ho:YAG laser lithotripsy was conducted as a two-arm comparison study, evaluating the target identification system against common lithotripsy. We assessed the ureters' lesions according to PULS and the other locations descriptively. Post-mortem nephroureterectomy and cystectomy specimens were examined by a pathologist., Results: The sufficient disintegration of stone samples was achieved in both setups. Endoscopic examination revealed numerous lesions in the urinary tract after the commercial Holmium laser system. The extent of lesions with the feedback system was semi-quantitatively and qualitatively lower. The energy applied was significantly less, with a mean reduction of more than 30% (URS 27.1%, PCNL 52.2%, bladder stone lithotripsy 17.1%). Pathology examination revealed only superficial lesions in both animals. There was no evidence of organ perforation in either study arm., Conclusions: Our study provides proof-of-concept for a laser system enabling automatic real-time target identification during lithotripsy on human urinary stones. Further studies in humans are necessary, and to objectively quantify this new system's advantages, investigations involving a large number of cases are mandatory., (© 2020. The Author(s).)

Published
2021
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48. Infrared Laser Application to Wood Cutting.

Author

Aniszewska M, Maciak A, Zychowicz W, Zowczak W, Mühlke T, Christoph B, Lamrini S, and Sujecki S

Abstract

While lasers are widely used across various industries, including woodworking, few studies to date have addressed the issue of cutting fresh wood. In the present investigation, wood stemming from fresh tree branches was cut at different laser powers and beam travel speeds. A fiber laser and a CO 2 laser were used for the research. The cellular structures of the cut surfaces were examined, with some of them found to be covered with a layer of compacted, charred cells. This may be a favorable phenomenon, preventing the invasion of pathogens via the wounds caused by laser beam branch cutting in nurseries, plantations, and orchards.

Published
2020
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49. Experimental Investigation of Actively Q-Switched Er 3+ :ZBLAN Fiber Laser Operating at around 2.8 µm.

Author

Sojka L, Pajewski L, Lamrini S, Farries M, Benson TM, Seddon AB, and Sujecki S

Abstract

A diode-pumped Q-switched Er 3+ :ZBLAN double-clad, single-transverse mode fiber laser is practically realized. The Q-switched laser characteristics as a function of pump power, repetition rate, and fiber length are experimentally investigated. The results obtained show that the Q-switched operation with 46 µJ pulse energy, 56 ns long pulses, and 0.821 kW peak power is achieved at a pulse repetition rate of 10 kHz. To the best of our knowledge, this is the highest-ever demonstrated peak power emitted from an actively Q-switched, single-transverse mode Er 3+ :ZBLAN fiber laser operating near 2.8 µm.

Published
2020
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